<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>删除 object 中某个属性 m</title>
</head>
<body>
    <script>
        var num ={
            m:'找的',
            name:'练习题'
        }
       delete num.m;
       console.log(num)
    </script>
</body>
</html>